The theory is that women have free floating ovarian cells in their peritoneum. In a non-Braca-1 or 2 woman, chances that one/some cells will turn cancerous is a fraction of a percent. As for a Braca-1 or 2 woman, the chances are just under 2 percent that one/some will turn cancerous. I'm a Braca-1. My peritoneal ovarian cell(s) became cancerous in 2015 after having had my benign ovaries removed in 2001 to prevent getting ovarian cancer in the first place. I've been fighting Primary Peritoneal Cancer (PPC) since 2015 (8 years), with no end in sight I never go into remission. There are other women with PPC that do go into remission. As for "adeno"carcinoma, I'm not sure what that is supposed to mean---It's probably no different.

My recurrence was diagnosed initially as metastatic adenocarcinoma. Since the tumor I found under my arm was considerably north of the ones initially found on my ovaries, there was some question as to if it was or was not ovarian cancer. After additional testing of the biopsy slides, it was determined that it was in fact ovarian cancer. I suspect it just means that your cancer started in Peritoneal location.

My high grade serous peritoneal cancer was staged after having a lot of testing such as biopsies done at Mayo in Rochester MN. Primary being ovarian cancer which is said to be one of the more common occurrences.

Wishing you luck!!

Just look it up.